What will cause negative pressure in the fermenters?

Dec 22, 2016
helen

7998
fermentation tank

What will cause negative pressure in the fermenters?

Many breweries today prefer to cleaning the fermentation tanks with hot water or sterilizing the tanks with steam, actually it is very dangerous.

Under ordinary pressure, the weight of 1M3 steam is 560g, but the weight of 1M3 water is 1ton. If the steam is condensed, its volume will reduce to 1/1786 of origin. Which may cause negative pressure and make the tanks dangerous.

Besides, if the discharge speed is much faster than the air flowing in speed; Or when the fermentation tanks washed by hot caustic liquid, the CO2 absorbed by the caustic liquid and caused volume shrinkage; Or the tanks washed by cold water after it is just showered by hot liquid etc. All these operations will cause negative pressure in the tank. So the temperature for cleaning the fermenters better not exceed 40℃.
What will cause negative pressure in the fermenters? .